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The Research on the Ca2+ Adsorption of ZMS

Author: LiuBenYi
Tutor: WangDongTian
School: Suzhou Institute of Technology
Course: Municipal Engineering
Keywords: Calcium ion 13X molecular sieves 4A molecular sieves sodium hydroxide sodium chloride
CLC: TU991.2
Type: Master's thesis
Year: 2010
Downloads: 39
Quote: 0
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Abstract


In this paper, the research on adsorption of Ca2+ on 4A and 13X zeolite molecular sieves are carried out. In static test, the primary influential factors of 4A and 13X zeolite molecular sieves on Ca2+ in water, fluid shear stress, reaction temperature, pH, different diameter of particles, have been experimentally studied. The result of saturation testing shows that the static saturated capacity of zeolite molecular sieves are about 50~52mg/g which means the zeolite molecular sieves are feasible in Ca2+ adsorption.The effect of Ca2+ adsorption by sodium hydroxide modified zeolite molecular sieves are better than other modified ways and then the best modified condition combination of zeolite molecular sieves are found by Orthogonal experiment. The Ca2+ saturated adsorption quantity of modified 4A and 13X zeolite molecular sieves are 82.82 and 80.38mg/g which are increased 59.4% and 63.1% respectively. And then the X-ray diffraction patterns confirm that the modified effect on the structure of zeolite molecular sieves.Sodium chloride as a regenerant has better regeneration effect on zeolite molecular sieves. The static saturated capacity of regenerative zeolite molecular sieves is about 30mg/g.The dynamic experiments showed the dynamic adsorption is obviously affected by the raw concentration and the water inflow velocity and when in the lower concentration and inflow velocity the effluent concentration curves are steady. The result indicates that the dynamic saturated capacity of modified 4A zeolite molecular sieves is 50.2 mg/g which is 3.78 times comparing to unchanged 4A zeolite molecular sieves, 13X zeolite molecular sieves is 49.23 mg/g which is 3.7 times comparing to unchanged 13X zeolite molecular sieves.

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CLC: > Industrial Technology > Building Science > Municipal Engineering > Water supply project ( on the Water Works ) > Clean Water ( water treatment )
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